Thomas m



(No Model.)

T. M. JOHNS & R. GAGE.

PUMP.

No. 252,946. Patented Jan. 31,1882.

N. PETERS. Phuloiflhwgfilpher. Washinglon. n.0,

UNrra STATES ATENT FFICE.

THOMAS M. JoHNs AND ROBERT GAGE, ortiirokson, MICHIGAN.

PUMP.

SPECIFICATION forming part of Letters Patent No. 252,946, dated January31, 1882,

Application filed S61)l(3111l)011-l,1881. (Nomodct) To all whom it mayconcern:

Be it known that we, THOMAS M. JOHNS and ROBERT GAGE, of Jackson, in thecounty of Jackson and State of Michigan, have invented an Improvement inPumps, of which the followingis a specification.

The nature of this invention relates to certain new and usefulimprovements in the construction of pumps of that class usuallydenominated "double-acting pumps, and the invention consists, first, inthe peculiar construction and application of the valve-chambers, whichare removably secured to the pum pcylinder; second, in the peculiarconstruction of the stuffing-box; and, third, in the peculiarconstruction, arrangement, and combinations of the various parts, all asmore fully hereinafter set forth.

In the accompanying drawing, which forms a part of this specification,and in which our invention is shown in central vertical section, Arepresents thepump-cylinder, provided with the removable head B upon oneend, while to the opposite end of the cylinder is cast theinwardlyprojecting stuftiug box 0, through which the p u mp-rod Dreciprocates, said pumprod being provided with a plunger, E. Thestuffing-box G is provided with the bushing a, surrounding the pump-rod,above which is a packing, b, and upon this is another bushing, d, whichis held in place by the head F, of which it forms an integral part.Above this bushing d is placed a packing, E, which is compressed andheld to place in the ordinary manner by means of a'follower, G. By thisconstruction we provide a double stuffing-box, through which thepump-rod reciprocates, and thereby very materially lessen the danger ofleakage at that point.

Near the lower end of the cylinder A is removably secured a doublevalve-chamber, H, a channel or water-way, It, being cut through the wallof the pump-cylinder, to afford communication between such cylinder andthe lower valve-chamber.

I is a suction-pipe projecting downward from the lower valve-chamber, z,said chamber being provided with a proper valve, J, which closes theoutlet of the suction-pipe I. From this valve-chamber t communication isbad with the upper chamber, j, through the channel k,

which is closed by a similar valve, K, the said upper valve-chamber,j,being provided with a discharge-pipe, I}, and an air-chamber, M. Upontheopposite side of the pump-cylinder and near the upper end thereof isremovably secured asingle valve-chamber, N, provided with asuction-pipe, O, and a valve, P, communication being had between suchvalve-chamber and the cylinder through the channel n. Upon the oppositeside from this valve-chamber N is similarly secured the valve-chamberIt,which is provided with the valve S and air-chamber T, thevalve-chamber being connected with the discharge-pipe L by means of apipe, U, while communication between this valve-chamber and the cylinderis had through the channel m. It is designed by us to have one wall ofeach of the valve-chain hers separately removable, or provided withhand-holes, so that communication can be had to the interior of thevalvechambers without necessarily entirely removing them, and to affordfacility for cleaning out the chambers or putting in new valves, asoocasion may require.

In practice, in the upstroke of the plunger water is drawn up throughthe pipe I into the lower valve-chamber, 4., from whence it passes intothe cylinder, following the plunger its entire stroke. In the downstrokeot'the plunger the water is forced back through the lower valve-chamber,t, closing the valve J and tintiing exit through the valve K into theupper valve-chamber,j,andoutthroughthedischargepipe L, while at the sametime water is drawn through the pipe 0 into the valve-chamber N, fromwhence it passes into the discharge L through the valve chamber R andpipe U. If preferred, the two discharge-valve chambers may be providedwith separate disch arge-pipes, so that two streams of water may bethrown.

What we claim as our invention, and desire to secure by Letters Patent,is-

1. A pump-cylinder, A, provided with a removable head, B, npon one end,the opposite head being cast with and forming an integral part of saidcylinder, and provided with the inwardly-projecting stuffing-box O, andports h m a, in combination with the valve-chambers H R N, secured tothe outside of said cylinder, substantially as set forth.

2. A stuffing-box for pump-rods, consisting ofthe box 0, bushing a.,andpacking b, in compipes I, O, L, and U, constructed, arranged, [Qbination with the follower F, provided with and operatingsubstantiallyin the mannerand the bushing (Ia-11d packing e, and theouter-t'olfor the purposes described. lower, G, substantially as and forthe purpose THOMAS M. JOHNS. 5 Speclfied' l POBFRT GAGE 3. Inadouble-acting pump, and in colnhina- I J tion with the cylinder Athereof, the valve Witnesses:

chambers H, N, and R, provided with the valves H. NORDMAN J, K, P, andS, air-chambers M and T, and ANTON BESLER.

